Birthday Calculator
See exactly how many days are left until the next birthday, and what age is being turned.
More details
Never Miss a Birthday
Enter a date of birth to see exactly how many days remain until the next birthday, what age is being turned, and which day of the week the birthday falls on this year.
Fun Facts About Birthdays
- People born on February 29 (leap day) technically have a birthday only once every four years — see our Leap Year Calculator to check any year.
- A “golden birthday” is when someone turns the age that matches their birth date’s day number (e.g., turning 15 on the 15th).
Frequently Asked Questions
How is the countdown calculated?
We compare today's date to the next occurrence of your birth month and day, and count the exact number of days remaining.
What if my birthday is today?
The calculator will roll forward to next year's date so the countdown always shows a full year ahead once your birthday has passed for the current year.
Can I find out what day of the week I was born?
Yes — the “More details” section shows the day of the week for your birth date.
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Open calculator →Last updated July 17, 2026. Reviewed by the ChronoAge editorial team Our editorial policy
This tool is for informational and professional-reference purposes. Always verify against official records for legal or clinical documentation.